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The domain fcdun.com states the following, "All aspects of effectice defense solutions." I observed that the website also said " Principles and types of shields." They also stated " 结合了syn Cookiesyn proxysaferesetsyn重传等算法并引入了IP信誉机制当来自某个源IP的第一个syn包到达时如果该IP的信誉值较高则采用syncookie算法;而对于信誉值较低的源IP则基于协议栈行为模式如果syn包得到验证则对该连接进入syncookie校验一旦该IP的连接得到验证则提高其信誉值 ICMP Flood 的攻击原理和ACK Flood原理类似属于流量型的攻击方式也是利用大的流量给服务器带来较大的负载影响服务器的正常服务 解决方法是 主动清除残余连接 对恶意连接的IP进行封禁 限制每个源IP的连接数 对特定的URL进行防护 反查Proxy后面发起HTTP Get Flood的源 对是否HTTP Get的判断要统计到达每个服务器的每秒钟的GET 请求数如果远远超过正常值就要对HTTP协议解码找出HTTP Get及其参数 例如URL等." The meta header had 腾正CDN as the first keyword. This keyword was followed by CDN加速, 图片网站加速, and 免费CDN which isn't as important as 腾正CDN. The other words the site used was 防CC攻击.